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Societies, especially in the developed world, were thought to be on the verge of becoming invulnerable to new plagues. Unfortunately, this expectation has proved to be spectacularly misplaced. Well into the twenty-first century smallpox remains the only disease to have been successfully eradicated. Worldwide, infectious diseases remain leading causes of death and serious impediments to economic growth and political stability. Newly emerging diseases such as Ebola, Lassa fever, West Nile virus, avian flu, Zika, and dengue present new challenges, while familiar afflictions such as tuberculosis and malaria have reemerged, often in menacing drug-resistant forms. Public health authorities have particularly targeted the persisting threat of a devastating new pandemic of influenza such as the “Spanish lady” that swept the world with such ferocity in 1918 and 1919.
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Frank M. Snowden III (Epidemics and Society: From the Black Death to the Present)